Rich,

 

You can crop the image by drawing it to another image object :

 

Image newimg=new System.Drawing.Bitmap(width,height,System.Drawing.Imaging.PixelFormat.Format24bppRgb);
using(System.Drawing.Graphics g=System.Drawing.Graphics.FromImage(newimg))
{
    g.InterpolationMode=System.Drawing.Drawing2D.InterpolationMode.High;
    g.DrawImage(srcimg
     , new System.Drawing.Rectangle(x,y,w,h)
     , new System.Drawing.Rectangle(0, 0, srcimg.Width, srcimg.Height)
     , System.Drawing.GraphicsUnit.Pixel);
}

newimg.Save(...)

When you have different width/height,x,y,w,h specified , you will get different result.

Calculate it to the value as you want.

 

Regards,
Terry